smtp.c

SIP 1.5.0源代码

 * Returns: T on success, NIL on failure
 */

long smtp_mail (SENDSTREAM *stream,char *type,ENVELOPE *env,BODY *body)
{
  /* Note: This assumes that the envelope will never generate a header of
   * more than 8K.  If your client generates godzilla headers, you will
   * need to install your own rfc822out_t routine via SET_RFC822OUTPUT
   * to use in place of this.
   */
  char tmp[8*MAILTMPLEN];
  long error = NIL;
  if (!(env->to || env->cc || env->bcc)) {
  				/* no recipients in request */
    smtp_fake (stream,SMTPHARDERROR,"No recipients specified");
    return NIL;
  }
  smtp_send (stream,"RSET",NIL);/* make sure stream is in good shape */
  strcpy (tmp,"FROM:<");	/* compose "MAIL FROM:<return-path>" */
  if (env->return_path && env->return_path->host &&
      !((env->return_path->adl &&
	 (strlen (env->return_path->adl) > SMTPMAXPATH)) ||
	(strlen (env->return_path->mailbox) > SMTPMAXLOCALPART) ||
	(strlen (env->return_path->host) > SMTPMAXDOMAIN)))
    rfc822_address (tmp,env->return_path);
  strcat (tmp,">");
  if (ESMTP.ok) {
    if (ESMTP.eightbit.ok && ESMTP.eightbit.want) strcat(tmp," BODY=8BITMIME");
    if (ESMTP.dsn.ok && ESMTP.dsn.want)
      strcat (tmp,ESMTP.dsn.full ? " RET=FULL" : " RET=HDRS");
  }
				/* send "MAIL FROM" command */
  if (!(smtp_send (stream,type,tmp) == SMTPOK)) return NIL;
				/* negotiate the recipients */
  if (env->to) smtp_rcpt (stream,env->to,&error);
  if (env->cc) smtp_rcpt (stream,env->cc,&error);
  if (env->bcc) smtp_rcpt (stream,env->bcc,&error);
  if (error) {			/* any recipients failed? */
      				/* reset the stream */
    smtp_send (stream,"RSET",NIL);
    smtp_fake (stream,SMTPHARDERROR,"One or more recipients failed");
    return NIL;
  }
				/* negotiate data command */
  if (!(smtp_send (stream,"DATA",NIL) == SMTPREADY)) return NIL;
				/* set up error in case failure */
  smtp_fake (stream,SMTPSOFTFATAL,"SMTP connection went away!");
				/* output data, return success status */
  return rfc822_output (tmp,env,body,smtp_soutr,stream->netstream,
			ESMTP.eightbit.ok && ESMTP.eightbit.want) &&
			  (smtp_send (stream,".",NIL) == SMTPOK);
}

/* Internal routines */


/* Simple Mail Transfer Protocol send recipient
 * Accepts: SMTP stream
 *	    address list
 *	    pointer to error flag
 */

void smtp_rcpt (SENDSTREAM *stream,ADDRESS *adr,long *error)
{
  char *s,tmp[MAILTMPLEN];
  while (adr) {			/* for each address on the list */
				/* clear any former error */
    if (adr->error) fs_give ((void **) &adr->error);
    if (adr->host) {		/* ignore group syntax */
				/* enforce SMTP limits to protect the buffer */
      if (adr->adl && (strlen (adr->adl) > SMTPMAXPATH)) {
	adr->error = cpystr ("501 Path too long");
	*error = T;
      }
      else if (strlen (adr->mailbox) > MAXLOCALPART) {
	adr->error = cpystr ("501 Recipient name too long");
	*error = T;
      }
      if ((strlen (adr->host) > SMTPMAXDOMAIN)) {
	adr->error = cpystr ("501 Recipient domain too long");
	*error = T;
      }
      else {
	strcpy (tmp,"TO:<");	/* compose "RCPT TO:<return-path>" */
	rfc822_address (tmp,adr);
	strcat (tmp,">");
				/* want notifications */
	if (ESMTP.ok && ESMTP.dsn.ok && ESMTP.dsn.want) {
				/* yes, start with prefix */
	  strcat (tmp," NOTIFY=");
	  s = tmp + strlen (tmp);
	  if (ESMTP.dsn.notify.failure) strcat (s,"FAILURE,");
	  if (ESMTP.dsn.notify.delay) strcat (s,"DELAY,");
	  if (ESMTP.dsn.notify.success) strcat (s,"SUCCESS,");
				/* tie off last comma */
	  if (*s) s[strlen (s) - 1] = '\0';
	  else strcat (tmp,"NEVER");
	}
				/* send "RCPT TO" command */
	if (!(smtp_send (stream,"RCPT",tmp) == SMTPOK)) {
	  *error = T;		/* note that an error occurred */
	  adr->error = cpystr (stream->reply);
	}
      }
    }
    adr = adr->next;		/* do any subsequent recipients */
  }
}

/* Simple Mail Transfer Protocol send command
 * Accepts: SMTP stream
 *	    text
 * Returns: reply code
 */

long smtp_send (SENDSTREAM *stream,char *command,char *args)
{
  long ret;
  do ret = smtp_send_work (stream,command,args);
  while (ESMTP.auth && smtp_send_auth (stream,ret));
  return ret;
}


/* SMTP send command worker routine
 * Accepts: SEND stream
 *	    text
 * Returns: reply code
 */

long smtp_send_work (SENDSTREAM *stream,char *command,char *args)
{
  long ret;
  char *s = (char *) fs_get (strlen (command) + (args ? strlen (args) + 1 : 0)
			     + 3);
				/* build the complete command */
  if (args) sprintf (s,"%s %s",command,args);
  else strcpy (s,command);
  if (stream->debug) mm_dlog (s);
  strcat (s,"\015\012");
				/* send the command */
  if (!net_soutr (stream->netstream,s))
    ret = smtp_fake (stream,SMTPSOFTFATAL,"SMTP connection broken (command)");
  else {
    do stream->replycode = smtp_reply (stream);
    while ((stream->replycode < 100) || (stream->reply[3] == '-'));
    ret = stream->replycode;
  }
  fs_give ((void **) &s);
  return ret;
}


/* SMTP send authentication if needed
 * Accepts: SEND stream
 *	    code from previous command
 * Returns: T if need to redo command, NIL otherwise
 */

long smtp_send_auth (SENDSTREAM *stream,long code)
{
  NETMBX mb;
  char tmp[MAILTMPLEN];
  switch (code) {
  case SMTPWANTAUTH: case SMTPWANTAUTH2:
    sprintf (tmp,"{%.200s/smtp",net_host (stream->netstream));
    if (stream->netstream->dtb ==
	(NETDRIVER *) mail_parameters (NIL,GET_ALTDRIVER,NIL))
      sprintf (tmp + strlen (tmp),"/%.200s",
	       (char *) mail_parameters (NIL,GET_ALTDRIVERNAME,NIL));
    strcat (tmp,"}<none>");
    mail_valid_net_parse (tmp,&mb);
    return smtp_auth (stream,&mb,tmp);
  }
  return NIL;			/* no auth needed */
}

/* Simple Mail Transfer Protocol get reply
 * Accepts: SMTP stream
 * Returns: reply code
 */

long smtp_reply (SENDSTREAM *stream)
{
  smtpverbose_t pv = (smtpverbose_t) mail_parameters (NIL,GET_SMTPVERBOSE,NIL);
  long reply;
				/* flush old reply */
  if (stream->reply) fs_give ((void **) &stream->reply);
  				/* get reply */
  if (!(stream->reply = net_getline (stream->netstream)))
    return smtp_fake (stream,SMTPSOFTFATAL,"SMTP connection went away!");
  if (stream->debug) mm_dlog (stream->reply);
  reply = atol (stream->reply);	/* return response code */
  if (pv && (reply < 100)) (*pv) (stream->reply);
  return reply;
}

/* Simple Mail Transfer Protocol send EHLO
 * Accepts: SMTP stream
 *	    host name to use in EHLO
 *	    NETMBX structure
 * Returns: reply code
 */

long smtp_ehlo (SENDSTREAM *stream,char *host,NETMBX *mb)
{
  unsigned long i;
  unsigned int j;
  long flags = (mb->secflag ? AU_SECURE : NIL) |
    (mb->authuser[0] ? AU_AUTHUSER : NIL);
  char *s,tmp[MAILTMPLEN];
  sprintf (tmp,"EHLO %s",host);	/* build the complete command */
  if (stream->debug) mm_dlog (tmp);
  strcat (tmp,"\015\012");
				/* send the command */
  if (!net_soutr (stream->netstream,tmp))
    return smtp_fake (stream,SMTPSOFTFATAL,"SMTP connection broken (EHLO)");
				/* got an OK reply? */
  do if ((i = smtp_reply (stream)) == SMTPOK) {
    ucase (strncpy (tmp,stream->reply+4,MAILTMPLEN-1));
    tmp[MAILTMPLEN-1] = '\0';
				/* note EHLO options */
    if ((tmp[0] == '8') && (tmp[1] == 'B') && (tmp[2] == 'I') &&
	(tmp[3] == 'T') && (tmp[4] == 'M') && (tmp[5] == 'I') &&
	(tmp[6] == 'M') && (tmp[7] == 'E') && !tmp[8]) ESMTP.eightbit.ok = T;
    else if ((tmp[0] == 'S') && (tmp[1] == 'I') && (tmp[2] == 'Z') &&
	     (tmp[3] == 'E') && (!tmp[4] || tmp[4] == ' ')) {
      if (tmp[4]) ESMTP.size.limit = atoi (tmp+5);
      ESMTP.size.ok = T;
    }
    else if ((tmp[0] == 'A') && (tmp[1] == 'U') && (tmp[2] == 'T') &&
	     (tmp[3] == 'H') && ((tmp[4] == ' ') || (tmp[4] == '='))) {
      for (s = strtok (tmp+5," "); s && *s; s = strtok (NIL," "))
	if ((j = mail_lookup_auth_name (s,flags)) &&
	    (--j < (8 * sizeof (ESMTP.auth)))) ESMTP.auth |= (1 << j);
    }
    else if ((tmp[0] == 'D') && (tmp[1] == 'S') && (tmp[2] == 'N') && !tmp[3])
      ESMTP.dsn.ok = T;
    else if ((tmp[0] == 'S') && (tmp[1] == 'E') && (tmp[2] == 'N') &&
	     (tmp[3] == 'D') && !tmp[4]) ESMTP.service.send = T;
    else if ((tmp[0] == 'S') && (tmp[1] == 'O') && (tmp[2] == 'M') &&
	     (tmp[3] == 'L') && !tmp[4]) ESMTP.service.soml = T;
    else if ((tmp[0] == 'S') && (tmp[1] == 'A') && (tmp[2] == 'M') &&
	     (tmp[3] == 'L') && !tmp[4]) ESMTP.service.saml = T;
    else if ((tmp[0] == 'E') && (tmp[1] == 'X') && (tmp[2] == 'P') &&
	     (tmp[3] == 'N') && !tmp[4]) ESMTP.service.expn = T;
    else if ((tmp[0] == 'H') && (tmp[1] == 'E') && (tmp[2] == 'L') &&
	     (tmp[3] == 'P') && !tmp[4]) ESMTP.service.help = T;
    else if ((tmp[0] == 'T') && (tmp[1] == 'U') && (tmp[2] == 'R') &&
	     (tmp[3] == 'N') && !tmp[4]) ESMTP.service.turn = T;
    else if ((tmp[0] == 'E') && (tmp[1] == 'T') && (tmp[2] == 'R') &&
	     (tmp[3] == 'N') && !tmp[4]) ESMTP.service.etrn = T;

    else if ((tmp[0] == 'R') && (tmp[1] == 'E') && (tmp[2] == 'L') &&
	     (tmp[3] == 'A') && (tmp[4] == 'Y') && !tmp[5])
      ESMTP.service.relay = T;
    else if ((tmp[0] == 'P') && (tmp[1] == 'I') && (tmp[2] == 'P') &&
	     (tmp[3] == 'E') && (tmp[4] == 'L') && (tmp[5] == 'I') &&
	     (tmp[6] == 'N') && (tmp[7] == 'I') && (tmp[8] == 'N') &&
	     (tmp[9] == 'G') && !tmp[10]) ESMTP.service.pipe = T;
    else if ((tmp[0] == 'E') && (tmp[1] == 'N') && (tmp[2] == 'H') &&
	     (tmp[3] == 'A') && (tmp[4] == 'N') && (tmp[5] == 'C') &&
	     (tmp[6] == 'E') && (tmp[7] == 'D') && (tmp[8] == 'S') &&
	     (tmp[9] == 'T') && (tmp[10] == 'A') && (tmp[11] == 'T') &&
	     (tmp[12] == 'U') && (tmp[13] == 'S') && (tmp[14] == 'C') &&
	     (tmp[15] == 'O') && (tmp[16] == 'D') && (tmp[17] == 'E') &&
	     (tmp[18] == 'S') && !tmp[19]) ESMTP.service.ensc = T;
  }
  while ((i < 100) || (stream->reply[3] == '-'));
  return i;			/* return the response code */
}

/* Simple Mail Transfer Protocol set fake error
 * Accepts: SMTP stream
 *	    SMTP error code
 *	    error text
 * Returns: error code
 */

long smtp_fake (SENDSTREAM *stream,long code,char *text)
{
				/* flush any old reply */
  if (stream->reply ) fs_give ((void **) &stream->reply);
  				/* set up pseudo-reply string */
  stream->reply = (char *) fs_get (20+strlen (text));
  sprintf (stream->reply,"%ld %s",code,text);
  return code;			/* return error code */
}


/* Simple Mail Transfer Protocol filter mail
 * Accepts: stream
 *	    string
 * Returns: T on success, NIL on failure
 */

long smtp_soutr (void *stream,char *s)
{
  char c,*t;
				/* "." on first line */
  if (s[0] == '.') net_sout (stream,".",1);
				/* find lines beginning with a "." */
  while (t = strstr (s,"\015\012.")) {
    c = *(t += 3);		/* remember next character after "." */
    *t = '\0';			/* tie off string */
				/* output prefix */
    if (!net_sout (stream,s,t-s)) return NIL;
    *t = c;			/* restore delimiter */
    s = t - 1;			/* push pointer up to the "." */
  }
				/* output remainder of text */
  return *s ? net_soutr (stream,s) : T;
}